The word “laser” is actually an initialism: Light Amplification by Stimulated Emission of Radiation.
By the logic of always using the pronunciation of the member letters as they are in the root words, then “laser” should be pronounced lah-seer.
We don’t pronounce it that way. For two reasons. First, the people who invented the term pronounced it lay-zer, and, second, it sounds dumb.
Look bro the creator of the word may not have wanted it to be pronounced the way it is, but JK Rowling never meant for Draco Malfoy and Ron Weasley to make sweet, sweet love to each other, either.
The internet does what it wants.